Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a5ac8ae0b576e87…

MALICIOUS

PDF

92.2 KB Created: 2021-09-11 07:45:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 183d913496268386d3500e6841005b6c SHA-1: d0a9fc65f01a66d30025d29b1caf00da8d81a137 SHA-256: 6a5ac8ae0b576e87c45a5be6509d74d407ad2f62b16533a6608e71b4b7837326
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised websites or link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure and URL patterns are consistent with a link farm used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://mamotato.ro/userfiles/file/pejufidegubizaguvo.pdf In PDF document text
    • https://bbu.vn/Images_upload/files/maxodebitexakelosewubat.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16136323f00a4c---69193067939.pdfIn PDF document text
    • http://www.electricman.in/demo/frontend/web/uploads/files/72486146363.pdfIn PDF document text
    • http://www.xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/12244789758.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/e34dc83a390987b712c0f5a313620bda/bupuxugi.pdfIn PDF document text
    • http://spadhotel.com/basefile/spadhotelcom/files/rapazegukewijaturo.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131b1031c95f---10796537930.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/malutovitibu.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/3328toavm76luhfd4mnh5vh9no/busazofu.pdfIn PDF document text
    • https://ip-kamera-rendszer.nuttydog.hu/ckfinder/userfiles/files/88430637256.pdfIn PDF document text
    • http://jjburgerut.com/uploads/files/64586856816.pdfIn PDF document text
    • https://www.sherpachristain.org.np/ckfinder/userfiles/files/44559204827.pdfIn PDF document text
    • http://sspvjd.com/FileData/ckfinder/files/20210902_43718ED485405764.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/42902136265.pdfIn PDF document text
    • http://biblioteka-belzec.pl/upload/files/68866736497.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/texefofapefapapoxiwepuve.pdfIn PDF document text
    • https://sagarexpress.com/userfiles/file/legewoxibutefukilenulude.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/32578085469.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c14e0568b2---76595051707.pdfIn PDF document text
    • https://ville-saintleonard.fr/pdf/tutaboparesiwu.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/lezigutimokogosap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=best+things+to+build+in+minecraftPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF58 11216 bytes
SHA-256: 0501da1f9cf5238547ce02811b7236e5778d101d6caf749774359878a42503bf
font_01_sfnt_off00011938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11938 19752 bytes
SHA-256: fc0355fd926b1244a1f8ab7056fbf6541c0e9705a78ba1bf765a1ad1e3e562c6
font_02_sfnt_off00014b1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1